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4,4-Dimethyl-2-pentyne

4,4-Dimethyl-2-pentyne structure

CAS No.: 999-78-0

Chemical Name:: 4,4-Dimethyl-2-pentyne

Synonyms: TIMTEC-BB SBB008719;(tert-C4H9)CequivCCH3;2,2-dimethyl-3-pentyne;1-tert-butyl-1-propyne;T-BUTYLMETHYLACETYLENE;4,4-DIMETHYL-2-PENTYNE;Propyne, 1-tert-butyl-;2-pentyne,4,4-dimethyl-;4,4-dimethyl-pent-2-yne;tert-butylmethylacetylene

CBNumber:: CB1484207

Molecular Formula:: C7H12

Molecular Weight:: 96.17

MDL Number:: MFCD00041613

MOL File:: 999-78-0.mol

MSDS File:: SDS

Last updated:2026-05-27 23:39:20

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4,4-Dimethyl-2-pentyne Properties

Melting point	-82.4°C
Boiling point	83°C
Density	0.718
refractive index	1.4071
Flash point	-10°C
form	liquid
color	colorless
Water Solubility	Immiscible with water.
BRN	1733540
Henry's Law Constant	3.0×10^-4 mol/(m³Pa) at 25℃, Yaws (2003)
CAS DataBase Reference	999-78-0
NIST Chemistry Reference	2-Pentyne, 4,4-dimethyl-(999-78-0)

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS02,GHS08

Signal word

Danger

Hazard statements

H225-H304

Precautionary statements

P210-P243-P301+P330+P331-P315-P403

Risk Statements

Safety Statements

9-16-33

RIDADR

3295

HazardClass

PackingGroup

NFPA 704

	3
3		0

4,4-Dimethyl-2-pentyne price More Price(7)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Strem Chemicals	06-0150	t-Butylmethylacetylene, min. 98% min.98%	999-78-0	1g	$50	2026-04-30	Buy
Strem Chemicals	06-0150	t-Butylmethylacetylene, min. 98% min.98%	999-78-0	5g	$199	2026-04-30	Buy
aablocks	AA003KD3	4,4-Dimethyl-2-pentyne min.98%	999-78-0	1g	$99	2026-05-28	Buy
aablocks	AA003KD3	4,4-Dimethyl-2-pentyne min.98%	999-78-0	5g	$275	2026-05-28	Buy
GFS CHEMICALS	83721	4,4-DIMETHYL-2-PENTYNE98%	999-78-0	5G	$119.85	2021-12-16	Buy

Product number	Packaging	Price	Buy
06-0150	1g	$50	Buy
06-0150	5g	$199	Buy
AA003KD3	1g	$99	Buy
AA003KD3	5g	$275	Buy
83721	5G	$119.85	Buy

4,4-Dimethyl-2-pentyne Chemical Properties, Uses, Production

Uses

4,4-Dimethyl-2-pentyne is used in organometallic reactions for regioselectivity of its insertion into the Pd-C bond of cyclopalladated complexes. It is also used to prepare pyrimidine-dione by reacting with isocyanate in the presence of nickel/ N-heterocyclic carbene.

Synthesis Reference(s)

Tetrahedron Letters, 22, p. 2443, 1981 DOI: 10.1016/S0040-4039(01)92928-4

4,4-Dimethyl-2-pentyne Preparation Products And Raw materials

Raw materials

Preparation Products

(2,2'-Bipyridine)dichloropalladium(II) 2-Pentenoic acid, 2,4,4-trimethyl-, (2E)-

4,4-Dimethyl-2-pentyne Suppliers

Global Suppliers ( 25)

Supplier	Tel	Email	Country	ProdList	Advantage
J & K SCIENTIFIC LTD.	18210857532 18210857532	jkinfo@jkchemical.com	China	96815	76
Alfa Aesar	400-6106006	saleschina@alfa-asia.com	China	30103	84
Shanghai Aladdin Bio-Chem Technology Co.,LTD	400-6206333 13167063860	anhua.mao@aladdin-e.com	China	29977	65
CONIER CHEM AND PHARMA LIMITED		sales@conier.com	China	49906	58
Shanghai Xx-lab New Materials Co., Ltd	13585834793 13660927110	xx_lab@126.com	China	1429	58
ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD	+86-15225627621 +86-13213167925	jiuyitime@fdachem.com	China	16504	58
DAYANG CHEM (HANGZHOU) CO.,LTD	+86-88938639 +86-17705817739	info@dycnchem.com	China	53589	58
Aladdin Scientific		tp@aladdinsci.com	United States	50068	58
Hebei Chuanghai Biotechnology Co., Ltd	+86-17732866630	mina@chuanghaibio.com	China	18112	58

Supplier	Advantage
J & K SCIENTIFIC LTD.	76
Alfa Aesar	84
Shanghai Aladdin Bio-Chem Technology Co.,LTD	65
CONIER CHEM AND PHARMA LIMITED	58
Shanghai Xx-lab New Materials Co., Ltd	58
ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD	58
DAYANG CHEM (HANGZHOU) CO.,LTD	58
Aladdin Scientific	58
Hebei Chuanghai Biotechnology Co., Ltd	58

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4,4-DIMETHYL-2-PENTYNE T-BUTYLMETHYLACETYLENE TIMTEC-BB SBB008719 (tert-C4H9)CequivCCH3 4,4-DIMETHYL-2-PENTYNE, 98%4,4-DIMETHYL-2-PENTYNE, 98%4,4-DIMETHYL-2-PENTYNE, 98%4,4-DIMETHYL-2-PENTYNE, 98% 4,4-Dimethyl-2-pentyne, 97+% t-Butylmethylacetylene, min. 98% 4,4-DIMETHYL-2-PENTYNE, 98%, t-Butylmethylacetylene,min.98% 1-tert-butyl-1-propyne 2,2-dimethyl-3-pentyne 2-pentyne,4,4-dimethyl- 4,4-dimethyl-pent-2-yne Propyne, 1-tert-butyl- tert-butylmethylacetylene 999-78-0 999780 CH33CCCCH3 C4H9CCCH3 organic compound